sys/platform/vkernel64/platform/machintr.c

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/machintr.h>
  39 #include <sys/errno.h>
  40 #include <sys/mman.h>
  41 #include <sys/globaldata.h>
  42 #include <sys/interrupt.h>
  43 #include <stdio.h>
  44 #include <signal.h>
  45 #include <machine/globaldata.h>
  46 #include <machine/md_var.h>
  47 #include <sys/thread2.h>
  48
  49 #include <unistd.h>
  50
  51 /*
  52  * Interrupt Subsystem ABI
  53  */
  54
  55 static void dummy_intr_disable(int);
  56 static void dummy_intr_enable(int);
  57 static void dummy_intr_setup(int, int);
  58 static void dummy_intr_teardown(int);
  59 static int dummy_legacy_intr_cpuid(int);
  60 static void dummy_finalize(void);
  61 static void dummy_intrcleanup(void);
  62 static void dummy_stabilize(void);
  63
  64 struct machintr_abi MachIntrABI = {
  65         MACHINTR_GENERIC,
  66         .intr_disable = dummy_intr_disable,
  67         .intr_enable =  dummy_intr_enable,
  68         .intr_setup =   dummy_intr_setup,
  69         .intr_teardown = dummy_intr_teardown,
  70         .legacy_intr_cpuid = dummy_legacy_intr_cpuid,
  71
  72         .finalize =     dummy_finalize,
  73         .cleanup =      dummy_intrcleanup,
  74         .stabilize =    dummy_stabilize
  75 };
  76
  77 static void
  78 dummy_intr_disable(int intr)
  79 {
  80 }
  81
  82 static void
  83 dummy_intr_enable(int intr)
  84 {
  85 }
  86
  87 static void
  88 dummy_intr_setup(int intr, int flags)
  89 {
  90 }
  91
  92 static void
  93 dummy_intr_teardown(int intr)
  94 {
  95 }
  96
  97 static void
  98 dummy_finalize(void)
  99 {
 100 }
 101
 102 static void
 103 dummy_intrcleanup(void)
 104 {
 105 }
 106
 107 static void
 108 dummy_stabilize(void)
 109 {
 110 }
 111
 112 static int
 113 dummy_legacy_intr_cpuid(int irq __unused)
 114 {
 115         return 0;
 116 }
 117
 118 /*
 119  * Process pending interrupts
 120  */
 121 void
 122 splz(void)
 123 {
 124         struct mdglobaldata *gd = mdcpu;
 125         thread_t td = gd->mi.gd_curthread;
 126         int irq;
 127
 128         while (gd->mi.gd_reqflags & (RQF_IPIQ|RQF_INTPEND|
 129                                      RQF_TIMER|RQF_KQUEUE)) {
 130                 crit_enter_quick(td);
 131                 if (gd->mi.gd_reqflags & RQF_IPIQ) {
 132                         atomic_clear_int(&gd->mi.gd_reqflags, RQF_IPIQ);
 133                         atomic_swap_int(&gd->mi.gd_npoll, 0);
 134                         lwkt_process_ipiq();
 135                 }
 136                 if (gd->mi.gd_reqflags & RQF_INTPEND) {
 137                         atomic_clear_int(&gd->mi.gd_reqflags, RQF_INTPEND);
 138                         while ((irq = ffs(gd->gd_spending)) != 0) {
 139                                 --irq;
 140                                 atomic_clear_int(&gd->gd_spending, 1 << irq);
 141                                 irq += FIRST_SOFTINT;
 142                                 sched_ithd_soft(irq);
 143                         }
 144                         while ((irq = ffs(gd->gd_fpending)) != 0) {
 145                                 --irq;
 146                                 atomic_clear_int(&gd->gd_fpending, 1 << irq);
 147                                 sched_ithd_hard_virtual(irq);
 148                         }
 149                 }
 150                 if (gd->mi.gd_reqflags & RQF_TIMER) {
 151                         atomic_clear_int(&gd->mi.gd_reqflags, RQF_TIMER);
 152                         vktimer_intr(NULL);
 153                 }
 154                 if (gd->mi.gd_reqflags & RQF_KQUEUE) {
 155                         atomic_clear_int(&gd->mi.gd_reqflags, RQF_KQUEUE);
 156                         kqueue_intr(NULL);
 157                 }
 158                 crit_exit_noyield(td);
 159         }
 160 }
 161
 162 /*
 163  * Allows an unprotected signal handler or mailbox to signal an interrupt
 164  *
 165  * For sched_ithd_hard_virtual() to properly preempt via lwkt_schedule() we
 166  * cannot enter a critical section here.  We use td_nest_count instead.
 167  */
 168 void
 169 signalintr(int intr)
 170 {
 171         struct mdglobaldata *gd = mdcpu;
 172         thread_t td = gd->mi.gd_curthread;
 173
 174         if (td->td_critcount || td->td_nest_count) {
 175                 atomic_set_int_nonlocked(&gd->gd_fpending, 1 << intr);
 176                 atomic_set_int(&gd->mi.gd_reqflags, RQF_INTPEND);
 177                 umtx_wakeup(&gd->mi.gd_reqflags, 0);
 178         } else {
 179                 ++td->td_nest_count;
 180                 cpu_ccfence();
 181                 atomic_clear_int(&gd->gd_fpending, 1 << intr);
 182                 sched_ithd_hard_virtual(intr);
 183                 cpu_ccfence();
 184                 --td->td_nest_count;
 185         }
 186 }
 187
 188 /*
 189  * Must block any signal normally handled as maskable interrupt.
 190  */
 191 void
 192 cpu_disable_intr(void)
 193 {
 194         sigblock(sigmask(SIGALRM)|sigmask(SIGIO)|sigmask(SIGUSR1)|
 195                  sigmask(SIGURG));
 196 }
 197
 198 void
 199 cpu_enable_intr(void)
 200 {
 201         sigsetmask(0);
 202 }
 203
 204 void
 205 cpu_mask_all_signals(void)
 206 {
 207         sigblock(sigmask(SIGALRM)|sigmask(SIGIO)|sigmask(SIGQUIT)|
 208                  sigmask(SIGUSR1)|sigmask(SIGTERM)|sigmask(SIGWINCH)|
 209                  sigmask(SIGUSR2)|sigmask(SIGURG));
 210 }
 211
 212 void
 213 cpu_unmask_all_signals(void)
 214 {
 215         sigsetmask(0);
 216 }